Control valve

ABSTRACT

The disclosure provides a control valve which includes a valve body and a valve gate. The valve gate is movably located inside the inner space. The control valve has a lower flow rate limit which is greater than zero. That is, the lower flow rate limit has no necessary to be zero, thus it is acceptable to have a cylindrical valve gate but not a spherical valve gate, and a diameter of the cylindrical valve gate is be smaller than a caliber of an opening of the valve body. Therefore, the valve gate can be directly installed into the valve body via the opening, which allows the valve body to be made of a single piece so as to simplify the processes of manufacturing and assembly.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent application is a divisional patent application of U.S. patent application No(s). 17/188,555 filed on Mar. 1, 2021 and entitled “CONTROL VALVE”, which is a divisional patent application of U.S. patent application Ser. No. 16/018,842 filed on Jun. 26, 2018 and entitled “CONTROL VALVE”, which is a non-provisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No(s). 201820713027.9 filed in China on May 14, 2018, the entire contents of which are hereby incorporated by reference.

TECHNICAL FIELD

The disclosure relates to a control valve.

BACKGROUND

In a cooling system, a control valve or bypass valve is commonly used to change the direction of fluid. Taken the control valve as an example, there are a rotary spool-type valve and a slide spool-type valve. The rotary spool-type valve is a valve that can pivot about its axis, and the slide spool-type valve is a valve that can slide along its axis. These valves can be operated either manually or electrically.

Generally, in order to ensure low leakage, a valve gate of the control valve is usually made spherical. However, the spherical valve gate is larger than a through hole of a valve body of the control valve, thus the spherical valve gate cannot be directly installed into the valve body via the through hole. The valve body must be able to be disassembled into many pieces for installing the spherical valve gate into the valve body. This makes the configuration of the control valve complicated and is inconvenient for assembly and manufacturing.

SUMMARY

Accordingly, the present disclosure provides a control valve which is simple in structure so as to avoid the inconveniences in the conventional control valve.

One embodiment of the disclosure provides a control valve, including a valve body and a valve gate. The valve gate is movably located inside the inner space. The control valve has a lower flow rate limit which is greater than zero.

One embodiment of the disclosure provides a control valve including a valve body and a valve gate. The valve body has an inner space, at least one fluid inlet and at least one fluid outlet, the at least one fluid inlet and the at least one fluid outlet correspond to the inner space, the valve body has an inner wall surrounding the inner space. The valve gate has an external wall and at least one main channel, the valve gate is movably located inside the inner space, the external wall and the inner wall form a bypass channel, the main channel penetrates through the external wall, and the main channel has at least one inlet end and at least one outlet end which respectively correspond to the at least one fluid inlet and the at least one fluid outlet. The valve gate is movable with respect to the valve body and pivotable between a closed position and an opened position; when the valve gate is in the closed position, the at least one inlet end and the at least one outlet end of the main channel are blocked by the valve body, such that the fluid inlet is connected to the fluid outlet only via the bypass channel; when the valve gate is in the opened position, the at least one inlet end and the at least one outlet end of the main channel are respectively connected to the at least one fluid inlet and the at least one fluid outlet, such that the fluid inlet is connected to the fluid outlet via the main channel and the bypass channel.

One embodiment of the disclosure provides a control valve includes a valve body and a valve gate. The valve body has at least one fluid inlet and at least one fluid outlet. The valve gate has at least one main channel and at least one bypass channel, the at least one main channel has at least one inlet end and at least one outlet end, a cross-sectional area of the main channel is greater than a cross-sectional area of the bypass channel, the valve gate is movably disposed within the valve body and is pivotable between a closed position and an opened position. When the valve gate is in the closed position, the at least one inlet end and the at least one outlet end of the main channel are blocked by the valve body, such that the fluid inlet is connected to the fluid outlet only via the bypass channel. When the valve gate is in the opened position, the inlet end and the outlet end of the bypass channel are blocked by the valve body, such that the fluid inlet is connected to the fluid outlet only via the main channel.

One embodiment of the disclosure provides a control valve including a valve body and a valve gate. The valve body has an inner space, an opening, a fluid inlet and a fluid outlet, and the opening, the fluid inlet and the fluid outlet correspond to the inner space. The valve gate includes an insertion portion and a cylindrical head connected to each other. The cylindrical head has a main channel having an inlet end and an outlet end which respectively correspond to the fluid inlet and the fluid outlet. A diameter of the cylindrical head is smaller than a caliber of the opening, such that the cylindrical head penetrates through the opening and the cylindrical head is movably located inside the inner space.

One embodiment of the disclosure provides a control valve including a valve body, a valve gate and at least one first seal ring. The valve body is made of a single piece, has an inner space, an opening, a fluid inlet and a fluid outlet, and the opening, the fluid inlet and the fluid outlet correspond to the inner space. The valve gate has a main channel, the main channel has an inlet end and an outlet end which correspond to the fluid inlet and the fluid outlet, the valve gate is disposed into the inner space via the opening. The at least one first seal ring is sleeved on the valve gate and located between and pressed by the valve body and the valve gate, such that the valve gate and the at least one first seal ring together seal the opening.

According to the control valve as discussed in above, the control valve has a lower flow rate limit which is greater than zero when it is in the closed position, which ensures fluid to still flow to a lower temperature heat source even when most of the fluid flows to a higher temperature heat source, thereby having a minimal cooling effect on the lower temperature heat source.

Furthermore, the lower flow rate limit has no necessary to be zero, thus it is acceptable to have a cylindrical valve gate but not a spherical valve gate, and a diameter of the cylindrical valve gate is smaller than a caliber of an opening of the valve body. Therefore, the valve gate can be directly installed into the valve body via the opening, which allows the valve body to be made of a single piece so as to simplify the processes of manufacturing and assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will become better understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only and thus are not intending to limit the present disclosure and wherein:

FIG. 1 is a perspective view of a control valve according to a first embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of FIG. 1 ;

FIG. 3 is a perspective view of the valve gate in FIG. 1 ;

FIG. 4 is a cross-sectional view of FIG. 3 ;

FIG. 5 is a perspective view of a control valve according to a second embodiment of the present disclosure;

FIG. 6 is a cross-sectional view of FIG. 5 ;

FIG. 7 is a perspective view of a control valve according to a third embodiment of the present disclosure;

FIG. 8 is a cross-sectional view of FIG. 7 ;

FIG. 9 is a perspective view of a control valve according to a fourth embodiment of the present disclosure;

FIG. 10 is a cross-sectional view of FIG. 9 ;

FIG. 11 is a perspective view of a control valve according to a fifth embodiment of the present disclosure;

FIG. 12 is a perspective view of a control valve according to a sixth embodiment of the present disclosure;

FIG. 13 is a perspective view of a control valve according to a seventh embodiment of the present disclosure;

FIG. 14 is a cross-sectional view of FIG. 13 ;

FIG. 15 is a perspective view of a control valve according to an eighth embodiment of the present disclosure;

FIG. 16 is a perspective view of a control valve according to a ninth embodiment of the present disclosure;

FIG. 17 is a perspective view of a control valve according to a tenth embodiment of the present disclosure;

FIG. 18 is a perspective view of a control valve according to an eleventh embodiment of the present disclosure;

FIG. 19 is a perspective view of a control valve according to a twelfth embodiment of the present disclosure;

FIG. 20 is a perspective view of a control valve according to a thirteenth embodiment of the present disclosure;

FIG. 21 is a perspective view of a valve gate disposed on a valve body when the valve gate is in a closed position;

FIG. 22 is a line chart of valve opening degree versus fluid flow rate showing the difference between the circle-shaped valve port and the anchor-shaped valve port;

FIG. 23 is a perspective view of a control valve according to a fourteenth embodiment of the present disclosure;

FIG. 24 is a perspective view of a control valve according to a fifteenth embodiment of the present disclosure;

FIG. 25 is a perspective view of a control valve according to a sixteenth embodiment of the present disclosure;

FIG. 26 is a perspective view of a control valve according to a seventeenth embodiment of the present disclosure.

FIG. 27 is a perspective view of a control valve according to an eighteenth embodiment of the present disclosure;

FIG. 28 is a perspective view of a control valve according to a nineteenth embodiment of the present disclosure; and

FIG. 29 is a perspective view of a control valve according to a twentieth embodiment of the present disclosure.

DETAILED DESCRIPTION

In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known main structures and devices are schematically shown in order to simplify the drawing.

Please refer to FIGS. 1 to 4 . FIG. 1 is a perspective view of a control valve according to a first embodiment of the present disclosure. FIG. 2 is a cross-sectional view of FIG. 1 . FIG. 3 is a perspective view of the valve gate in FIG. 1 . FIG. 4 is a cross-sectional view of FIG. 3 .

This embodiment provides a control valve 10 a. The control valve 10 a includes a valve body 100 a, a valve gate 200 a, a driving element 300 a and a plurality of seal rings 400 a.

The valve body 100 a is, for example, made of a single piece, by injection molding process or cutting process. The valve body 100 a has an inner space 110 a and an opening 120 a corresponding to the inner space 110 a. The valve body 100 a has an inner wall 130 a surrounding the inner space 110 a. The valve body 100 a further has a fluid inlet 140 a and a fluid outlet 150 a which penetrate through the inner wall 130 a and are connected to the inner space 110 a. That is, the opening 120 a, the fluid inlet 140 a and the fluid outlet 150 a all are connected to the inner space 110 a.

The valve gate 200 a is pivotably located inside the inner space 110 a and is pivotable between a closed position (please refer to FIGS. 3 and 4 ) and an opened position (please refer to FIGS. 1 and 2 ). In detail, the valve gate 200 a includes an insertion portion 201 a and a cylindrical head 202 a which are connected to each other. The insertion portion 201 a is disposed through the opening 120 a, and the cylindrical head 202 a is located in the inner space 110 a. The seal rings 400 a are, for example, rubber rings, and are sleeved on the insertion portion 201 a, such that the insertion portion 201 a and the seal rings 400 a together seal the opening 120 a. The driving element 300 a is fixed on the valve body 100 a, and is configured to drive the valve gate 200 a to pivot about an axis A (e.g., in a direction of a) with respect to the valve body 100 a.

The cylindrical head 202 a has an external wall 210 a and a main channel 220 a. The main channel 220 a is in a cylinder shape. The main channel 220 a penetrates through the external wall 210 a. The main channel 220 a has an inlet end 221 a and an outlet end 222 a which are opposite to each other. When the valve gate 200 a is in the opened position (please refer to FIGS. 1 and 2 ), the inlet end 221 a and the outlet end 222 a are respectively aligned with the fluid inlet 140 a and the fluid outlet 150 a of the valve body 100 a, such that fluid can flow in a direction of F from the fluid inlet 140 a to the fluid outlet 150 a via the main channel 220 a. When the valve gate 200 a is in the closed position (please refer to FIGS. 3 and 4 ), the inlet end 221 a and the outlet end 222 a and the fluid inlet 140 a and the fluid outlet 150 a are completely unaligned, which prevents fluid from flowing through the main channel 220 a.

In this embodiment, the inlet end 221 a of the main channel 220 a and the fluid inlet 140 a of the valve body 100 a are the same in shape, and/or the inlet end 221 a of the main channel 220 a and the fluid inlet 140 a of the valve body 100 a are the same in size. By this configuration, when the inlet end 221 a and the outlet end 222 a of the main channel 220 a are respectively aligned with the fluid inlet 140 a and the fluid outlet 150 a of the valve body 100 a, fluid can flow in the direction of F from the fluid inlet 140 a to the fluid outlet 150 a in a smoother manner. However, the present disclosure is not limited to such configuration. In some other embodiments, as long as fluid can flow in the direction of F from the fluid inlet 140 a to the fluid outlet 150 a, the inlet end 221 a of the main channel 220 a and the fluid inlet 140 a of the valve body 100 a may be in different shapes and sizes.

The external wall 210 a and the inner wall 130 a are loose fit, and there is a bypass channel 230 a formed between the external wall 210 a and the inner wall 130 a. The flow rate of the bypass channel 230 a is less than the flow rate of the main channel 220 a. The bypass channel 230 a is an annular passage extending from the fluid inlet 140 a to the fluid outlet 150 a. Thus, whether the valve gate 200 a is in the opened position or the closed position, the fluid inlet 140 a is connected to the fluid outlet 150 a via the bypass channel 230 a. That is, when the valve gate 200 a is in the opened position, fluid can flow from the fluid inlet 140 a and the fluid outlet 150 a via both the main channel 220 a and the bypass channel 230 a. Therefore, there is an upper limit flow rate when the control valve 10 a is in the opened position. When the valve gate 200 a is in the closed position, fluid still can flow from the fluid inlet 140 a to the fluid outlet 150 a via the bypass channel 230 a; thus there is a lower flow rate limit when the control valve 10 a is in the closed position, and the lower flow rate limit is greater than zero.

Then, taking a liquid cooling system in a server cabinet (not shown) as an example to explain the reason why the lower flow rate limit of the control valve 10 a is greater than zero. The liquid cooling system in the server cabinet (not shown) includes a plurality of water blocks, a plurality of pipes, a pump and a plurality of control valves 10 a. The water blocks are disposed at different servers in the server cabinet so as to exchange heat with these servers, or disposed at different heat sources in the same server so as to exchange heat with these heat sources. The pipes are connected between the water blocks and the pump so as to form a cooling circulation. The control valves 10 a are installed on the pipes in order to control the flow rate for each heat source. It is understood that a higher temperature heat source requires larger flow rate, and a lower temperature heat source requires lesser flow rate, thus the control valve 10 a corresponding to the higher temperature heat source would be switched to the opened position, and the other control valve 10 a corresponding to the lower temperature heat source would be switched to the closed position so as to ensure most of the fluid to flow to the higher temperature heat source. Even so, the control valve 10 a corresponding to the lower temperature heat source still have a lower flow rate limit which is greater than zero, thus fluid still will flow to the lower temperature heat source even when most of the fluid flows to the higher temperature heat source, thereby having a minimal cooling effect on the lower temperature heat source.

On the other hand, the lower flow rate limit has no necessary to be zero, thus it is acceptable to have a cylindrical valve gate 200 a but not a spherical valve gate, and a diameter D1 of the cylindrical head 202 a can be smaller than a caliber D2 of an opening 120 a. Therefore, the cylindrical head 202 a of the valve gate 200 a can be directly installed into the valve body 100 a via the opening 120 a, which allows the valve body 100 a to be made of a single piece so as to simplify the processes of manufacturing and assembly of the control valve 10 a.

In this embodiment, the quantity of the seal rings is two, but the present disclosure is not limited thereto. In some other embodiments, the control valve may only have one seal ring or more than three seal rings. Furthermore, in the previous embodiment, the valve gate is driven by an electric motor, but the present disclosure is not limited thereto. In some other embodiments, the valve gate may be driven or controlled by fluid pressure. In addition, the valve body may further have heat fins for heat dissipation.

However, it is noted that the bypass channel 230 a formed between the external wall 210 a of the valve gate 200 a and the inner wall 130 a of the valve body 100 a is one of the ways to achieve a lower flow rate limit greater than zero, the other variations for achieving the same are described in the following paragraphs.

When the valve gate is in the opened position, fluid may only flow through the main channel instead of flowing through the bypass channel. Please refer to FIGS. 5 and 6 . FIG. is a perspective view of a control valve according to a second embodiment of the present disclosure. FIG. 6 is a cross-sectional view of FIG. 5 .

This embodiment provides a control valve 10 b. The control valve 10 b includes a valve body 100 b, a valve gate 200 b, a driving element 300 b, two first seal rings 400 b and two second seal rings 450 b.

The valve body 100 b has an inner space 110 b and an opening 120 b which corresponds to the inner space 110 b. The valve body 100 b has an inner wall 130 b surrounding the inner space 110 b. The valve body 100 b further has a fluid inlet 140 b and a fluid outlet 150 b which penetrate through the inner wall 130 b. That is, the opening 120 b, the fluid inlet 140 b and the fluid outlet 150 b are all connected to the inner space 110 b.

The valve gate 200 b is pivotably located inside the inner space 110 b. In detail, the valve gate 200 b includes an insertion portion 201 b and a cylindrical head 202 b which are connected to each other. The insertion portion 201 b penetrates through the opening 120 b, and the cylindrical head 202 b is located in the inner space 110 b. The cylindrical head 202 b has an external wall 210 b and a main channel 220 b. The main channel 220 b is in a cylinder shape. The main channel 220 b penetrates through the external wall 210 b. The main channel 220 b has an inlet end 221 b and an outlet end 222 b which are opposite to each other. The two first seal rings 400 b and the two second seal rings 450 b are, for example, rubber rings. The first seal rings 400 b are sleeved on the insertion portion 201 b, such that the insertion portion 201 b and the first seal rings 400 b together seal the opening 120 b. The second seal rings 450 b are disposed on the cylindrical head 202 b, and respectively surround the inlet end 221 b and the outlet end 222 b of the main channel 220 b. The driving element 300 b is fixed on the valve body 100 b, and is configured to drive the valve gate 200 b to pivot with respect to the valve body 100 b.

Since the second seal rings 450 b respectively surround the inlet end 221 b and the outlet end 222 b of the main channel 220 b, such that, when the valve gate 200 b is in the opened position, fluid only can flow from the fluid inlet 140 b to the fluid outlet 150 b via the main channel 220 b instead of flowing through the aforementioned bypass channel 230 a.

In addition, the quantities of the inlet end and the outlet end are not restricted. For example, please refer to FIGS. 7 and 8 . FIG. 7 is a perspective view of a control valve according to a third embodiment of the present disclosure. FIG. 8 is a cross-sectional view of FIG. 7 .

This embodiment provides a control valve 10 c. The control valve 10 c includes a valve body 100 c, a valve gate 200 c, a driving element 300 c and two seal rings 400 c.

The valve body 100 c has an inner space 110 c and an opening 120 c which corresponds to the inner space 110 c. The valve body 100 c has an inner wall 130 c surrounding the inner space 110 c. The valve body 100 c further has two fluid inlets 140 c and a fluid outlet 150 c which penetrate through the inner wall 130 c. That is, the opening 120 c, the two fluid inlets 140 c and the fluid outlet 150 c are all connected to the inner space 110 c. From the viewpoint of FIG. 7 , the two fluid inlets 140 c are located at two opposite sides of the valve body 100 c, and the fluid outlet 150 c is located at the bottom surface of the valve body 100 c.

The valve gate 200 c is pivotably located inside the inner space 110 c. In detail, the valve gate 200 c includes an insertion portion 201 c and a cylindrical head 202 c which are connected to each other. The insertion portion 201 c penetrates through the opening 120 c, and the cylindrical head 202 c is located in the inner space 110 c. The cylindrical head 202 c has an external wall 210 c and a main channel 220 c. The main channel 220 c is a T-shaped channel, and penetrates through the external wall 210 c. The main channel 220 c has two inlet ends 221 c which are opposite to each other and an outlet end 222 c. The two inlet ends 221 c respectively correspond to the two fluid inlets 140 c, and the outlet end 222 c corresponds to the fluid outlet 150 c.

The two seal rings 400 c are, for example, rubber rings. The seal rings 400 c are sleeved on the insertion portion 201 c, such that the insertion portion 201 c and the first seal rings 400 c together seal the opening 120 c. The driving element 300 c is fixed on the valve body 100 c, and is configured to drive the valve gate 200 c to pivot with respect to the valve body 100 c.

When the valve gate 200 c is in the opened position (please refer to FIGS. 7 and 8 ), the two inlet ends 221 c and the outlet end 222 c of the main channel 220 c are respectively aligned with the two fluid inlets 140 c and the fluid outlet 150 c of the valve body 100 c, such that fluid can flow from the fluid inlet 140 c to the fluid outlet 150 c via the main channel 220 c along the direction of F.

The embodiment in FIG. 7 shows a case of two fluid inlets and one fluid outlet, but the present disclosure is not limited thereto. In some other embodiments, it can be changed into a case of two fluid outlets and one fluid inlet.

For example, please refer to FIGS. 9 and 10 . FIG. 9 is a perspective view of a control valve according to a fourth embodiment of the present disclosure. FIG. 10 is a cross-sectional view of FIG. 9 .

This embodiment provides a control valve 10 d. The control valve 10 d includes a valve body 100 d, a valve gate 200 d and a driving element 300 d. The valve gate 200 d is pivotably located inside the inner space 110 d. The driving element 300 d is fixed on the valve body 100 d, and is configured to drive the valve gate 200 d to pivot with respect to the valve body 100 d.

In detail, the valve body 100 d has a plurality of fluid inlets 140 d and a fluid outlet 150 d. From the viewpoint of FIG. 9 , the fluid inlets 140 d are divided into two groups, and the two groups of fluid inlets 140 d are respectively located at two opposite sides of the valve body 100 d. The fluid outlet 150 d is located at the bottom surface of the valve body 100 d.

The valve gate 200 d has a main channel 220 d. The main channel 220 d has two groups of inlet ends 221 d which are opposite to each other and an outlet end 222 d. The inlet ends 221 d correspond to the fluid inlets 140 d, and the outlet end 222 d corresponds to the fluid outlet 150 d. The fluid inlets 140 d and the inlet ends 221 d are arranged along an axial direction of the valve gate 200 d.

Please refer to FIGS. 11 and 12 . FIG. 11 is a perspective view of a control valve according to a fifth embodiment of the present disclosure. FIG. 12 is a perspective view of a control valve according to a sixth embodiment of the present disclosure.

As shown in FIG. 11 , this embodiment provides a control valve 10 e. The control valve 10 e includes a valve body 100 e, a valve gate 200 e and a driving element 300 e. The valve gate 200 e is pivotably located inside the inner space 110 e. The driving element 300 e is fixed on the valve body 100 e, and is configured to drive the valve gate 200 e to pivot with respect to the valve body 100 e.

In detail, the valve body 100 e has a plurality of fluid inlets 140 e and a fluid outlet 150 e. From the viewpoint of FIG. 11 , the fluid inlets 140 e are divided into four groups, and the four groups of fluid inlets 140 e are respectively located at four different sides of the valve body 100 e. The fluid outlet 150 e is located at the bottom surface of the valve body 100 e.

The valve gate 200 e has a main channel 220 e. The main channel 220 e has four groups of inlet ends 221 e and an outlet end 222 e. The inlet ends 221 e correspond to the fluid inlets 140 e, and the outlet end 222 e corresponds to the fluid outlet 150 e. The fluid inlets 140 e and the inlet ends 221 e are arranged along an axial direction of the valve gate 200 d, and two of the fluid inlets 140 e which are at the adjacent groups are on the same height. As shown in figure, a center of the most top fluid inlet 140 e of one of the group has a height of D3 from the bottom surface, and a center of the most top fluid inlet 140 e of the adjacent group has a height of D4 from the bottom surface, and D3 is equal to D4.

In addition, the embodiment in FIG. 12 is similar to the embodiment in FIG. 11 , but they still have a difference in the arrangement of fluid inlets. As shown in FIG. 12 , a center of the most top fluid inlet 140 f of one of the group has a height of D5 from the bottom surface, and a center of the most top fluid inlet 140 f of the adjacent group has a height of D6 from the bottom surface, and D5 is greater than D6.

Then, please refer to FIGS. 13 and 14 . FIG. 13 is a perspective view of a control valve according to a seventh embodiment of the present disclosure. FIG. 14 is a cross-sectional view of FIG. 13 .

This embodiment provides a control valve 10 g. The control valve 10 g includes a valve body 100 g, a valve gate 200 g and a driving element 300 g. The valve gate 200 g is pivotably located inside the inner space 110 g. The driving element 300 g is fixed on the valve body 100 g, and is configured to drive the valve gate 200 g to pivot with respect to the valve body 100 g.

In detail, the valve body 100 g has a plurality of first fluid inlets 140 g, a plurality of second fluid inlets 140 g′ and a fluid outlet 150 g. The fluid outlet 150 g is located at the bottom surface of the valve body 100 e. The first fluid inlets 140 g are located at a side of the fluid outlet 150 g. The second fluid inlets 140 g′ are located at another side of the fluid outlet 150 g opposite to the first fluid inlets 140 g, and the first fluid inlets 140 g and the second fluid inlets 140 g′ are arranged along a radial direction of the valve gate 200 g. In this embodiment, the first fluid inlets 140 g and the second fluid inlets 140 g′ are respectively located at two opposite sides of the fluid outlet 150 g, but the present disclosure is not limited thereto. In some other embodiments, the first fluid inlets and the second fluid inlets may be respectively located at two adjacent sides of the fluid outlet.

The valve gate 200 g has a main channel 220 g. The main channel 220 g has a first inlet end 221 g, a second inlet end 221 g′ and an outlet end 222 g. The first inlet end 221 g is connected to the first fluid inlets 140 g, and the second inlet end 221 g′ is connected to the second fluid inlets 140 g′, and the outlet end 222 g is connected to the fluid outlet 150 g.

The embodiment in FIG. 13 shows a case of multiple fluid inlets and one fluid outlet, but the present disclosure is not limited thereto. In some other embodiments, it can be changed into a case of one fluid inlet and multiple fluid outlets.

In the case that the lower flow rate limit has no necessary to be zero, the cylindrical head may be changed into a spherical head. For example, please refer to FIG. 15 . FIG. 15 is a perspective view of a control valve according to an eighth embodiment of the present disclosure.

This embodiment provides a valve gate 200 h. The valve gate 200 h includes an insertion portion 201 h and a spherical head 202 h which are connected to each other. The spherical head 202 h has a main channel 220 h. The main channel 220 h has two inlet ends 221 h and an outlet end 222 h. The two inlet ends 221 h are respectively located at two opposite sides of the spherical head 202 h, the outlet end 222 h is located between the two inlet ends 221 h. The spherical head 202 h can be disposed at a valve body, and the spherical head 202 h and the valve body have a gap therebetween, such that the spherical head 202 h and the valve body form a bypass channel therebetween.

Please refer to FIG. 16 . FIG. 16 is a perspective view of a control valve according to a ninth embodiment of the present disclosure. This embodiment provides a valve gate 200 i. The valve gate 200 i includes an insertion portion 201 i and a cylindrical head 202 i which are connected to each other.

In detail, the cylindrical head 202 i has a main channel 220 i. The main channel 220 i has a plurality of inlet ends 221 i and 221 i′ and an outlet end 222 i. The quantity of the inlet ends 221 i is two, and the two inlet ends 221 i are respectively located at two opposite sides of the cylindrical head 202 i. The quantity of the inlet ends 221 i′ is two, and the two inlet ends 221 i′ are respectively located at two opposite sides of the cylindrical head 202 i. The inlet ends 221 i′ are arranged along an axial direction of the valve gate 200 i, and a cross-sectional area of the inlet end 221 i is greater than a cross-sectional area of the inlet end 221 i′. The outlet end 222 i is located at a side of the cylindrical head 202 i away from the insertion portion 201 i. Similarly, the cylindrical head 202 i can be disposed at a valve body, and the cylindrical head 202 i and the valve body have a gap therebetween, such that the cylindrical head 202 i and the valve body form a bypass channel therebetween.

In addition, in this embodiment, the inlet end 221 i and the inlet end 221 i′ are both connected to an outlet end 222 i, thus there is only one main channel, and the main channel has multiple inlet ends and one outlet end, but the present disclosure is not limited thereto. In some other embodiments, there may be more than one separated main channels which extend in a radial direction of the valve gate and are arranged along an axial direction of the valve gate. That is, the aforementioned outlet end 222 i is removed, and the inlet end 221 i or the inlet end 221 i′ is changed into an outlet end. In the case that the separated main channels are arranged in a vertical manner, the main channels are not connected to each other, the upper main channel has an inlet end and an outlet end respectively at opposite ends thereof, and the lower main channel has an inlet end and an outlet end respectively at opposite ends thereof. In addition, the extension directions of these two main channels are parallel or perpendicular to each other, and a cross-sectional area of the upper main channel is different from a cross-sectional area of the lower main channel.

In the above embodiment, the bypass channel is formed by the gap between the valve body and the valve gate, but the present disclosure is not limited thereto. Please refer to FIG. 17 . FIG. 17 is a perspective view of a control valve according to a tenth embodiment of the present disclosure. This embodiment provides a valve gate 200 j, and the valve gate 200 j includes an insertion portion 201 j and a cylindrical head 202 j which are connected to each other.

In detail, the cylindrical head 202 j has a main channel 220 j and a bypass channel 230 j. The main channel 220 j has an inlet end 221 j and an outlet end 222 j. The inlet end 221 j and the outlet end 222 j are respectively located at two opposite sides of the cylindrical head 202 i. A cross-sectional area of the bypass channel 230 j is smaller than a cross-sectional area of the main channel 220 j. The bypass channel 230 j penetrates through the main channel 220 j, and an extension direction of the bypass channel 230 j is orthogonal to an extension direction of the main channel 220 j. Therefore, when the inlet end 221 j and the outlet end 222 j of the main channel 220 j are respectively aligned with the fluid inlet and the fluid outlet of the valve body (as the fluid inlet and the fluid outlet shown in FIG. 1 ), fluid can flow from the fluid inlet to the fluid outlet via the main channel 220 j. When the inlet end 221 j and the outlet end 222 j of the main channel 220 j and the fluid inlet and the fluid outlet of the valve body are completely unaligned (as the fluid inlet and the fluid outlet shown in FIG. 3 ), fluid can flow from the fluid inlet to the fluid outlet via the bypass channel 230 j (i.e., fluid flows at a lower flow rate limit which is greater than zero).

Please refer to FIG. 18 . FIG. 18 is a perspective view of a control valve according to an eleventh embodiment of the present disclosure. A main channel 220 k of a valve gate 200 k has a cross section substantially in a circle, but the present disclosure is not limited thereto.

Please refer to FIG. 19 . FIG. 19 is a perspective view of a control valve according to a twelfth embodiment of the present disclosure. This embodiment provides a valve gate 200 l, and the valve gate 200 l has a main channel 220 l. The main channel 220 l has a cross section having a first side 224 l and a second side 225 l opposite to each other. The first side 224 l has a width W2, the second side 225 l has a width W1, and the width W2 substantially equals to the width W1. In addition, in this embodiment, the cross section of the main channel 220 l is a slot-shaped cross section, and a long side 223 l of the cross section has an extension direction E which is orthogonal to an axis A of the valve gate 220 l, but the present disclosure is not limited thereto. In some other embodiments, the long side of the cross section may be parallel to the axis of the valve gate.

Then, please refer to FIGS. 20 to 22 . FIG. 20 is a perspective view of a control valve according to a thirteenth embodiment of the present disclosure. FIG. 21 is a perspective view of a valve gate disposed on a valve body when the valve gate is in a closed position. FIG. 22 is a line chart of valve opening degree versus fluid flow rate showing the difference between the circle-shaped valve port and the anchor-shaped valve port.

As shown in FIG. 20 , this embodiment provides a valve gate 200 m, the valve gate 200 m has a main channel. The main channel has a valve port 220 m and a valve port 220 m′ which are opposite to each other, and the valve port 220 m and the valve port 220 m′ each have an anchor-like shape. Take the valve port 220 m for an example, the valve port 220 m has a first side 224 m and a second side 225 m opposite to each other. The first side 224 m has a width W4, the second side 225 m has a width W3, and the width W4 is different from the width W3.

As shown in FIG. 21 , the valve gate 200 m is in the closed position, meaning that the valve ports 220 m and 220 m′ of the valve gate 200 m are not aligned with two fluid inlets 140 m of a valve body 100 m. The valve gate 200 m can be pivoted 90 degrees with respect to the valve body 100 m in a direction of b so as to be switched to the opened position. When the valve gate 200 m is in the opened position, the valve ports 220 m and 220 m′ are respectively aligned with the fluid inlets 140 m, such that fluid can flow from the fluid inlets 140 m to the fluid outlet 150 m. Then, the valve gate 200 m can be pivoted in a direction of c to be switched back to the closed position.

The reason why the widths are different is to make the flow rate control of the valve gate 200 m more of a linear trend line. In detail, in the embodiment that the cross section of the main channel in a circle as shown in FIG. 1 , the relationship between the valve opening degree and the fluid flow rate does not perform a smooth linear line but a line that goes up rapidly and then levels off (as the dotted line shown in FIG. 22 ). In contrast, in the embodiment that the cross section of the main channel in an anchor-like shape as shown in FIG. 20 , in the preliminary of opening the valve gate 200 m, the middle portion of the anchor-like shape (closer to the second side 225 m) which has a narrower width is aligned with the fluid inlet first, and then the curved portion of the anchor-like shape (closer to the first side 224 m) which has a wider width is aligned with the fluid inlet while the valve gate 200 m opens wider. The middle portion of the anchor-like shape with a narrower width helps the relationship between the valve opening degree and the fluid flow rate to vary in a slower manner when the valve gate is preliminarily opened, and the curved portion of the anchor-like shape with a wider width helps the relationship to vary more rapidly when the valve gate is more opened. As the solid line shown in FIG. 22 , the relationship between the valve opening degree and the fluid flow rate becomes more of a linear trend line. It is noted that, as long as the width W4 of the first side 224 m is different from the width W3 of the second side 225 m, having an anchor-like shaped cross section of valve port would not be the only solution to make the relationship more of a linear trend line.

From the viewpoint of FIG. 20 , the first sides 224 m of the valve port 220 m and the valve port 220 m′ are pivoted in the same direction, meaning that the two anchor-like shape point in opposite directions. Therefore, while the valve gate 200 m is pivoted in the direction of b, both of the valve ports 220 m and 220 m′ of the main channel align with the fluid inlet 140 m via the middle portions of the anchor-like shapes (the portions closer to the second sides 225 m), and then gradually align with the fluid inlet 140 m via the curved portions of the anchor-like shapes. As such, the relationship between the valve opening degree and the fluid flow rate can vary in a slower manner because the middle portion of the anchor-like shape has a narrower width, and the relationship can vary more rapidly because the curved portion of the anchor-like shape has a wider width.

In addition, the present disclosure is not limited to the shape of the valve port. For example, please refer to FIGS. 23 to 29 , FIG. 23 is a perspective view of a control valve according to a fourteenth embodiment of the present disclosure. FIG. 24 is a perspective view of a control valve according to a fifteenth embodiment of the present disclosure. FIG. is a perspective view of a control valve according to a sixteenth embodiment of the present disclosure. FIG. 26 is a perspective view of a control valve according to a seventeenth embodiment of the present disclosure. FIG. 27 is a perspective view of a control valve according to an eighteenth embodiment of the present disclosure. FIG. 28 is a perspective view of a control valve according to a nineteenth embodiment of the present disclosure. FIG. 29 is a perspective view of a control valve according to a twentieth embodiment of the present disclosure.

As shown in FIG. 23 , a valve gate 200 n has a main channel 220 n, and the main channel 220 n has an anchor-like shaped cross section, but the anchor-like shape in FIG. 23 and the anchor-like shape in FIG. 20 point in opposite directions. As shown in FIG. 24 , a valve gate 200 o has a main channel 220 o, and the main channel 220 o has a pear-shaped cross section. As shown in FIG. 25 , a valve gate 200 p has a main channel 220 p, and the main channel has a cross section which has a narrowed middle part. As shown in FIG. 26 , a valve gate 200 q has a main channel 220 q, and the main channel 220 q has a triangular cross section. As shown in FIG. 27 , a valve gate 200 r has a main channel 220 r, and the main channel 220 r has a baseball bat-shaped cross section. As shown in FIG. 28 , a valve gate 200 s has a plurality of main channels 220 s which are arranged in an order of size along a radial direction of the valve gate 200 s. As shown in FIG. 29 , a valve gate 200 r has a main channel 220 r, and the main channel 220 r has another pear-shaped cross section.

According to the control valve as discussed in above, the control valve has a lower flow rate limit which is greater than zero when it is in the closed position, which ensures fluid to still flow to a lower temperature heat source even when most of the fluid flows to a higher temperature heat source, thereby having a minimal cooling effect on the lower temperature heat source.

Furthermore, the lower flow rate limit has no necessary to be zero, thus it is acceptable to have a cylindrical valve gate but nor a spherical valve gate, and a diameter of the cylindrical valve gate can be smaller than a caliber of an opening of the valve body. Therefore, the valve gate can be directly installed into the valve body via the opening, which allows the valve body to be made of a single piece so as to simplify the processes of manufacturing and assembly.

Moreover, the different widths of the cross sections of the two sides of the main channel help the flow rate control of the valve gate to become more of a linear trend line.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present disclosure. It is intended that the specification and examples be considered as exemplary embodiments only, with a scope of the disclosure being indicated by the following claims and their equivalents. 

What is claimed is:
 1. A control valve, comprising: a valve body having an inner space, wherein the valve body has a plurality of fluid inlets and a fluid outlet, the fluid inlets are divided into two groups, and the two groups of fluid inlets are respectively located at two opposite sides of the valve body, the fluid outlet is located at a bottom surface of the valve body; and a valve gate, the valve gate movably located inside the inner space, wherein the valve gate has a main channel, the main channel has two groups of inlet ends which are opposite to each other and an outlet end, the inlet ends correspond to the fluid inlets, and the outlet end corresponds to the fluid outlet, the fluid inlets and the inlet ends are arranged along an axial direction of the valve gate; wherein, the control valve having a lower flow rate limit which is greater than zero.
 2. The control valve according to claim 1, wherein the valve gate is pivotably disposed on the valve body.
 3. The control valve according to claim 1, wherein when the plurality of inlet ends and the outlet end are respectively completely unaligned with the plurality of fluid inlets and the fluid outlet, the control valve has the lower flow rate limit.
 4. The control valve according to claim 1, wherein the main channel has a circle-shaped cross section. 